When I was in 6th grade, we had to put on a play for the school. To make some props, we used newspaper and tapioca (sp?) flour, boiled together to make a gooey sludge. The good thing about it is that it's easy to clean from you hands and it isn't extremely sticky, just slimy. It holds together pretty well. You just pour some of the mix into a tray (Pie tin works best), dip the newspaper in it, and then use two fingers to scrape off the excess sludge. Lay it onto your surface, smooth it out, and let it dry. It turns out pretty hard, but it's not the most sturdy thing you could use.